Error initInitialise: Can't lock /var/run/pigpio.pid

[ajjsss]

Getting error "Can't lock /var/run/pigpio.pid" when attempting to run Blink_Test as shown below:

pi@raspberrypi:~ $ sudo java -Djava.library.path=/home/pi -jar Desktop/Test_Blink.jar
Test_Blink
2017-12-05 11:36:46 initInitialise: Can't lock /var/run/pigpio.pid
jpigpio.PigpioException: (-1) pigpio initialisation failed
at jpigpio.Pigpio.gpioInitialize(Native Method)
at tests.Test_Blink.run(Test_Blink.java:43)
at tests.Test_Blink.main(Test_Blink.java:30)

[a-weinert]

I have exactly the same problem with the linked (non socket) variant.
Additionally, the socket variant would run but do nothing at all with I/O.
Note: On the same Raspi C-control programmes using the installed pigpiod daemon work flawlessly.
Note 2: Its a 3b with headless Stretch. I just use the git cloned library

• 03.05.2019 19:24 206.623 libJPigpioC.so

More help / documentation would be fine.
Thanks a lot in advance
Albrecht